Science : Ch 11 – The Human Eye and the Colourful World

A clear sky appears blue, because:

The absorption of light by a molecule depends on the

The red colour of the sun at the time of sunrise and sunset is because:

Power of a lens is the measure of the degree of

Arjun remarked that he has seen wavering of objects when seen through a stream of hot air rising above a tandoor or a fire. He said that the air just above the fire becomes hotter than the air further higher up. He further said that this wavering can also be seen in the earth’s atmosphere as the earth’s atmosphere is not evenly distributed ,Name two observations which can be explained by the above phenomenon.

What would have been the colour of sky if the earth had no atmosphere

Light which consists of only one colour or single wavelength is called Monochromatic

The splitting of light into its component colours is called

The defect in a person can see nearby objects but not far away objects

The defect the eye cannot focus objects both horizontally and vertically at the same time

Lenses which have both concave and convex structure.

Myopia can be corrected by using

The colour of scattered light depends on the

The emergent ray in a prism bend at an angle to the direction of the

The refractive index of glass is largest for